Instrument



FIG. 1 is a perspective view of an instrument.

FIG. 2 is a front view of the instrument shown in FIG. 1; and,

FIG. 3 is a right side view of the instrument shown in FIG. 1.

The bottom, top, and rear views are not shown and form no part of the claimed design.

The broken lines illustrate portions of the instrument that form no part of the claimed design. 

CLAIM The ornamental design for an instrument, as shown and described. 